/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.felix.prefs.impl;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.felix.prefs.BackingStoreManager;
import org.apache.felix.prefs.PreferencesDescription;
import org.apache.felix.prefs.PreferencesImpl;
import org.osgi.service.prefs.BackingStoreException;
import org.osgi.service.prefs.Preferences;
import org.osgi.service.prefs.PreferencesService;
/**
* This is an implementation of the OSGI Preferences Service, Version 1.1.
*/
public class PreferencesServiceImpl implements PreferencesService {
/** This is the system preferences tree. */
protected PreferencesImpl systemTree;
/** This is the map containing the user preferences trees. */
protected final Map trees = new HashMap();
/** The service id for the bundle this service belongs to. */
protected final Long bundleId;
/** The backing store manager. */
protected final BackingStoreManager storeManager;
public PreferencesServiceImpl(Long id,
BackingStoreManager storeManager) {
this.bundleId = id;
this.storeManager = storeManager;
try {
// load prefs first
PreferencesImpl[] prefs = null;
prefs = this.storeManager.getStore().loadAll(storeManager, this.bundleId);
for(int i=0;i<prefs.length;i++) {
if ( prefs[i].getDescription().getIdentifier() == null ) {
this.systemTree = prefs[i];
} else {
this.trees.put(prefs[i].getDescription().getIdentifier(), prefs[i]);
}
}
} catch (BackingStoreException e) {
// we ignore this here
}
}
/**
* @see org.osgi.service.prefs.PreferencesService#getSystemPreferences()
*/
public synchronized Preferences getSystemPreferences() {
if ( this.systemTree == null ) {
this.systemTree = new PreferencesImpl(new PreferencesDescription(this.bundleId, null), this.storeManager);
}
// sync with latest version from store
try {
this.systemTree.sync();
} catch (BackingStoreException ignore) {
// we ignore this
}
return this.systemTree;
}
/**
* @see org.osgi.service.prefs.PreferencesService#getUserPreferences(java.lang.String)
*/
public synchronized Preferences getUserPreferences(String name) {
PreferencesImpl result = (PreferencesImpl) this.trees.get(name);
// if the tree does not exist yet, create it
if (result == null || !result.isValid()) {
result = new PreferencesImpl(new PreferencesDescription(this.bundleId, name), this.storeManager);
this.trees.put(name, result);
}
// sync with latest version from store
try {
result.sync();
} catch (BackingStoreException ignore) {
// we ignore this
}
return result;
}
/**
* @see org.osgi.service.prefs.PreferencesService#getUsers()
*/
public synchronized String[] getUsers() {
// TODO - we have to sync with the store
final Set userKeys = this.trees.keySet();
return (String[])userKeys.toArray(new String[userKeys.size()]);
}
protected List getAllPreferences() {
final List list = new ArrayList();
if ( this.systemTree != null ) {
list.add(this.systemTree);
}
list.addAll(this.trees.values());
return list;
}
}